"Willpower" is a new book out by Psychologist Roy F. Baumeister and New York Times science columnist John Tierney. In experiments first reported in 1998, Baumeister showed that the willpower is like a muscle that can be fatigued by overuse. He also showed that self-control can be learned, and that the willpower's muscle can be reinvigorated.
Sounds fascinating. I may buy the iBook version with the iTunes gc I got for my 10th sobriety anniversary lol. If I do, I will tell you all about it.